帶有DataTemplate的ListPicker的SelectedIndex或SelectedItem

我使用Listpicker來允許用戶選擇顏色。所以我使用Toolkit Listpicker和包含文本框的DataTemplate來顯示它的列表項。我想要的是當頁面加載時，先前選擇的顏色（項目）被自動選中。但它給了我一個明顯的'System.InvalidOperationException'異常，因爲這些項目不是簡單地添加，而是通過datatemplate文本框添加的。請大家幫幫我：帶有DataTemplate的ListPicker的SelectedIndex或SelectedItem

<toolkit:ListPicker x:Name="BackgroundColor" FullModeHeader="Select Background Color:" Header="Background Color:" BorderThickness="0" FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}" ItemTemplate="{StaticResource PickerItemTemplate}" Background="#FF09043C" SelectionChanged="BackgroundColor_SelectionChanged" > 

      </toolkit:ListPicker> 

      <phone:PhoneApplicationPage.Resources> 
    <DataTemplate x:Name="PickerItemTemplate"> 
     <TextBlock Text="{Binding BackGroundColorString}" /> 
    </DataTemplate> 

    <DataTemplate x:Name="PickerFullModeItemTemplate" > 
     <Grid x:Name="rootGrid" Margin="0"> 

      <StackPanel Orientation="Horizontal"> 
       <TextBlock Name="BackgroundColor" 
        Text="{Binding BackGroundColorString}" 
          /> 
      </StackPanel> 
     </Grid> 
    </DataTemplate> 
        </phone:PhoneApplicationPage.Resources>

if (SunderGutkaSettings.Contains(SG_KEY_BACKGROUNDCOLOR)) //check if key is not present, read value 
     { 
      if (BackGroundColorList.Count != 0)//test if list if not empty 
      { 

       var ListPickerBackGroundColorRead = BackGroundColorList[singletonInstance.SelectedFontColorIndex] as BackGroundlistPickerClass; //pull whole class 

       string ListPickerBackGroundColorReadString = ListPickerBackGroundColorRead.BackGroundColorString; 

       int ListPickerBackGroundColorReadStringToIndex = BackGroundColorList.FindIndex(x => x.BackGroundColorString.StartsWith(ListPickerBackGroundColorReadString)); 

       BackgroundColor.SelectedIndex = ListPickerBackGroundColorReadStringToIndex; //DISABLE FOR testing      


      }

事實上，在simplyfing我的代碼： BackgroundColor.SelectedIndex = 0;不工作也不 BackgroundColor.SelectedItem =「紅色」;

幫助我

來源

2014-09-06 Atìf Shabëër

你的問題不清楚！你想做什麼？ – Sajeetharan 2014-09-06 06:58:21

如何設置具有DataTemplate的ListPicker的SelectedItem？ – 2014-09-06 06:59:28

而你的ItemsSource是什麼？ – 2014-09-06 08:09:11

設置的項目，

This.BackgroundColor.SelectedItem = YourObject;

這是你如何讓ListPicker的selectedItem屬性，也許你需要投給您綁定到列表中選擇器

private void BackgroundColor_SelectionChanged(object sender, SelectionChangedEventArgs e) 
    { 
     var item = (sender as ListPicker).SelectedItem; 
    }

對象

來源

2014-09-06 07:02:02 Sajeetharan

帶有DataTemplate的ListPicker的SelectedIndex或SelectedItem

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